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Liquid crystal display device and image display method thereof

A liquid crystal display device and image display technology, applied to static indicators, instruments, etc., can solve the problems of reducing power consumption and being unable to adopt, and achieve the effects of reducing power consumption, improving quality, and suppressing the deviation of brightness or color tone

Inactive Publication Date: 2008-11-12
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the structure described in the above-mentioned non-patent document 1 cannot be adopted at all.
[0013] In addition, as described in the above-mentioned Non-Patent Document 1 or the above-mentioned Patent Documents 1 to 3, by adopting a structure in which the backlight device is divided into a plurality of areas, and the emission luminance of the backlight is controlled for each area according to the brightness of the video signal, it is possible to Reduction of power consumption, but further reduction of power consumption is required

Method used

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  • Liquid crystal display device and image display method thereof
  • Liquid crystal display device and image display method thereof
  • Liquid crystal display device and image display method thereof

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no. 1 approach

[0068] Hereinafter, a liquid crystal display device according to a first embodiment of the present invention and an image display method used in the device will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a liquid crystal display device according to Embodiment 1 of the present invention. In FIG. 1 , video signals displayed on a liquid crystal panel 34 in a liquid crystal module unit 30 described later are supplied to a maximum grayscale detection unit 11 and a frame memory 13 in a video signal processing unit 10 . As will be described later, the backlight device 35 is divided into a plurality of regions, and the liquid crystal panel 34 is divided into a plurality of regions corresponding to each region of the backlight device 35. For each region of the liquid crystal panel 34, the brightness (the amount of light) of the backlight ) are controlled separately.

[0069] figure 2 It is an example of area division on...

no. 2 approach

[0124] 21 is a block diagram showing an overall configuration of a liquid crystal display device according to a second embodiment of the present invention. In FIG. 21, the same parts as those in FIG. 1 are given the same reference numerals, and description thereof will be appropriately omitted. In addition, in FIG. 21 , the non-uniformization processing unit 21 in FIG. 1 is omitted for simplification, but a configuration having the non-uniformization processing unit 21 may also be used as in the first embodiment.

[0125] As described above, in the first embodiment, the light emission luminance Bo of light to be emitted by the light sources 352 in the plurality of regions of the backlight device 35 is obtained from the emission luminance calculation unit 22 to make the light sources 352 in the plurality of regions emit light. The luminance Bo is the luminance value at the center point of each area. Figure 22 (A) indicates that only the backlight device 35 such as Figure 4 ...

no. 3 approach

[0132] 26 is a block diagram showing the overall configuration of a liquid crystal display device according to Embodiment 3 of the present invention. In FIG. 26, the same parts as those in FIG. 1 are given the same reference numerals, and description thereof will be appropriately omitted. In addition, in FIG. 26 , the non-uniformization processing unit 21 in FIG. 1 is omitted for simplification, but a configuration having the non-uniformization processing unit 21 may also be used as in the first embodiment. In addition, in FIG. 26, although the light emission amount calculation part 25 is the same as that of 2nd Embodiment, the structure which removes the light emission amount calculation part 25 may be sufficient.

[0133] 27(A) is a situation where the liquid crystal panel 34 is divided into areas 34a-34d corresponding to the areas 35a-35d of the backlight device 35A, showing that the gray scale of the areas 34a, 34b, and 34d is 0 (that is, black) and the area 34c is The ca...

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Abstract

A backlight device is divided into multiple regions, and has a configuration in which light emitted from a light source of each of the regions is allowed to leak to other regions. A maximum gradation detector detects a maximum gradation of a regional image signal displayed on each of the regions of the liquid crystal panel. An image gain calculator obtains a gain to be multiplied to each regional image signal. An emission luminance calculator obtains an emission luminance of light to be emitted by each light source, by using an operation expression according to the emission luminance of light to be emitted by the backlight device. At this time, if the emission luminance takes a negative value as a result of calculation, the emission luminance calculator makes a correction so that the emission luminance can take a value equal to or greater than 0.

Description

technical field [0001] The present invention relates to a liquid crystal display device having a backlight device, and an image display method for controlling the luminance of the backlight in the backlight device to display image signals. Background technique [0002] In a liquid crystal display device that displays images using a liquid crystal panel, since the liquid crystal panel itself does not emit light, a backlight device is provided, for example, on the back of the liquid crystal panel. The liquid crystal panel can be in an OFF state for blocking light and an ON state for transmitting light through a state where no voltage is applied and a state where voltage is applied. Therefore, by controlling the state of voltage application to a plurality of pixels provided on the liquid crystal panel, the plurality of pixels are driven as electronic shutters, and the amount of light emitted from the backlight passing through the liquid crystal panel is controlled to display im...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/34G09G3/20G02F1/133
Inventor 大岛芳则
Owner VICTOR CO OF JAPAN LTD
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